The cob we have on loan who in the last couple of days has scratched the inside of the top of his legs raw, do mites go further than the heel or would it be something else
We have a shetland pony who scratched all the skin off the inside of her back legs three years ago, we never found out what exactly caused it. My own theory was that it was mites off the straw bed in the stable. We got steriod cream to treat the chaffing and stopped using straw, there has been no further incidents of itching or chaffing since.
It's quite common for horses to itch at this time of year due to them shedding their winter coat, could just be that assuming it's not mites which would be my first thought ...
It could be that he is hot and sweaty - this weather is strange. Would not do any harm to give a few squirts of frontline in the area - Chancer had sheath mites last year and I sprayed the inside of his hind legs and carefully round the sheath and belly area to get rid of them. His legs were covered in oil and sulphur and had no signs of mites and were left.
Cairo loves to have the inside of his legs scratched - lifts his leg up like a dog peeing and is in seventh heaven when I get my claws out.
They all seem itchy at the moment - even though mine are fully clipped out, they are still moulting.
For the time being I have damped the inside top of his legs and rubbed some sulphur powder on to see if that helps at all, but they are all moulting badly as you say hair is flying everywhere at the moment!!!
My cob has exactly the same, gets it every year this time of year. His is because he is too hot and gets really itchy. He has very sensitive skin. I put E45 cream on just to stop him damaging his self to much but really there is not a lot I can do for him. Even if he is clipped out and unrugged he still gets it.
My cob has leg mites which are mainly on the back of the knees and then on the back of his hind legs and can cause raw leisons and scabs. When he first had it it spread up his legs and under his belly. The vet came and gave him an injection but now use Frontline (dog and cat flea spray) vets recommend this. I also keep his legs clipped and bed him on shavings. Hope this helps.